Muck deflector for drills



G. M. NELL MUCK DEFLECTOR FOR DRILLS April 3U, 11935.

Filed Feb. 24, 1951 INVENTOR. asare All /l/e// @MUM A TTORNE Y.

Patented pr. 30, 1935 Y Y 1,999,662 y, Y MUCK DEFLECTQR `FOR, DBILLS Gustave M. Nell, Detroit, Mich., assignor to Chicago 'Pneumatic Tooll Company, ANew York, N. Y., a corporation of New Jersey `Application February 24, 1931, Serial No. 517,672

1 Claim.

ferred to as stoping drills or stopers. vMore par- 5 ticularly it concerns detachable apparatus VVfor keeping muck, grit, cuttings, and the like out of the forward end of suchmachines.

Among the objectsofthe invention are to provide a simple form of muck deiiector which is inexpensive to manufacture and easy to apply, which has a smooth exterior, and which will maintain its position of adjustment, and in general to improve prior devices in the interest of more efficient and satisfactory service.

The invention involves the use of a simple deiiector device which is readily applied to the forward end of the machine. It takes the form of a rigid ring and a resilient ring in telescoping engagement with each other. The resilient ring which is preferably of rubber or a rubber compound is within the rigid ring and when Ythe device is in place it is compressed between the rigid ring and the machine to grip the latter and offer great frictional resistance to movement thereon. A deflecting skirt may be attached to or form an integral part of either ring. In the preferred form the outer ring is of metal and the deecting skirt is a flared portion thereof.

In order to illustrate the invention concrete embodiments thereof are shown in the accompanying drawing, in which:

Fig. 1 is a fragmentary side elevational view of the front end of a stoping drill;

Fig. 2 is a longitudinal sectional View of the parts shown in Fig. l;

Fig. 3 is an end elevational view of the parts shown in Fig. l; and

Figs. 4 and 5 are fragmentary sectional views showing modications.

The invention is disclosed as applied to a conventional stoper drill having a front head 6 from which projects a rotatable chuck sleeve 'I having a bore receiving the polygonal shank of drill steel 8. A bushing 9 is pressed into the outer end of front head 6 to provide a bearing at ID for chuck sleeve 'i which has a radially extending stop flange la engaging the inner end face of bushing 9. The reduced inner portion of chuck sleeve 'I has telescoping engagement with chuck I I rotatably mounted within front head 6. Chuck sleeve 'i is caused to rotate with chuck I I by means of an interengaged spline arrangement at I2. Chuck I I is rotated by any desired or known mechanism (not shown) and the blow of the percussive element (not shown) may b e transmitted to steel 8 through an anvil block I3 mounted in chuck II.

The muck excluding and deflecting means shown innits preferred formjin Figs. 1 3 comprise telescopingly engaged outer and inner ring mem- ,f5 bers Hand I 5 sleeved as a unit over the projecting portion of chuck sleeve l. Outer ring I4, Willich is preferably Vof hard rigid rmaterialksuch as metal is formed at its rearward end with an annular flaring flange or skirt I6 which projects radially over and beyond the end of front head 6. Its forward end is inturned to form a stop flange II defining one end of the annular recess in which elastic ring I5 is disposed. The minimum internal diameter of ring Ii, as at iiange I 1, is greater than the external diameter of chuck sleeve 'I so that outer ring I 4 is freely slidable thereover. The internal diameter of elastic ring I5, however, is less than the external diameter of chuck sleeve 'I so that when rings I4 and I5 are assembled in nested telescoped arrangement and the assembly is forced over the projecting end of chuck sleeve 1, elastic ring I5 is compressed between outer ring I4 and the chuck sleeve, thereby establishing a frictional grip therebetween so that the deiiector is securely maintained in adjusted position in spite of the vibration of the machine and of the shocks and blows incident to service.

To insure the removal of the inner elastic ring with the outer ring when it is necessary to remove the deiiector, as when chuck sleeve I is to be renewed, a slight modication may be made in the outer ring as indicated in Fig. 5. Here outer ring I4a has both a forward inturned flange Ila and in addition a rearward inturned flange I8 within the annular flaring extension or skirt Ia so that elastic ring |50'. is confined within an annular recess in ring Ida having stop anges at both ends.

In the modification shown in Fig. 4 the flaring extension or skirt I9 is attached to or forms a part of the inner elastic ring 2|). The latter has an annular recess 20a cut or moulded into its exterior, in which is seated the outer ring 2 I, in the present instance in the form of a relatively 4' narrow band of rigid material such as metal.

From the above it will be apparent that the outer ring member of the deflector assembly pro- Vvides a rigid wall devoid of sharp projections,

tional resistance to movement of the assembly on the object may be varied as desired by the thickness and the composition of the inner elastic ring, that either ring may provide a recess for the other, and that the aring deflector extension or skirt may be attached to or form a part of either rmg.

In assembling the two rings it has been found that bythe use of lubricant on both rings a much tighter elastic ring4 can be readily forced into telescoping relation with the outer ring than is possible Without the use of lubricant. When once in place, the deector of this invention is the equivalent of a known arrangement in which a split delector is compressed over an elastic ring by means of a bolt and it accomplishesthesame and even better results since it isobviously simpler, stronger, and cheaper to make. When used with a revolving chuck such as illustrated in the drawing, it has the marked advantage of.,

and its resiliency cooperate to prevent movement of the complete deilector assembly in a longitudinal as well as a rotary direction.

While the invention has been herein disclosed in what are now considered to be preferred forms, it is to be understood that the invention is not limited to the specic details thereof but covers all changes, modifications, and adaptations within the scope of the appended claims.

I claim as my invention:

. In a rock drilling machine having a front head and a tool receiving chuck sleeve extending therebeyond and rotatable therein, the extending portion of the chuck sleeve having a smooth cylindrical periphery, a muck deecting device sleeved rover said chuck sleeve adjacent said front head,

said deflecting device comprising a funnel-shaped member of'rubber or rubber compound having a cylindrical portion adapted to snugly embrace said chuck sleeve and a flaring portion extending axially and radially away from said cylindrical portion, the external surface of the cylindrical portion having an annular groove terminating in a flange at eachend thereof and a rigid one-piece un# broken ring seated in said groove and engaging said flanges and adapted to hold the rubber member tightly on said chuck sleeve.

f GUSTAVE M. NELL. 

